Manolis Perakakis world

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Prime time for Distributed Speech Recognition? February 23, 2009

While an undergraduate student a few years ago I worked on Distributed Speech Recognition (DSR). The main purpose of DSR is to compress the acoustic features used by a speech recognizer, over a data (instead of voice) network, thus saving bandwidth (cost effective) and allowing the use of full speech recognition in mobile terminals. As it compresses acoustic features for speech recognition (not speech signal transmission/reproduction) purposes it can achieve very low bit rates. You can think of it as analogous of what mp3 is for music transmission and storage.

Depicted next is a simple overview of a DSR architecture (model 2). Note that the mobile terminals depicted are Symbian’s reference devices corresponding to smartphone, handheld and PDA respectively (Ooops too old images – it should be back in 2001; should upgrade to something like iPhone or Android …)

My work with Prof. V.Digalakis concluded that one can successfully take advantage of DSR with only a 2 kbps coding, which is an extremely low data rate. After that i ported the DSR engine to a Zaurus Linux PDA and made it work in real-time (a 16MB, 200 MHz StrongArm processor).

Although my recent work focus is now on Multi-modal (speech) interfaces I still keep an eye on DSR. It seems that with the emergence of powerful mobile terminals and the announcement of speech recognition support for Android and iPhone by Google, DSR might become soon a hot topic!

P.S. I just found out my DSR page is ranked 3rd by Google after W3C and ETSI. Holy moly!

Coolness factor: ?


The year of Augmented Reality

Filed under: android,augmented reality,mobile — perak @ 5:24 am

Wikitude AR Travel Guide

Untill now there was too much hype around augmented reality since except for some really cool demos and research prototypes no real end user apps existed. Well, it seems that with the emergence of power mobile devices, augmented reality will find it’s way to the public with mobile users to be the first. Wikitude Android App is one of the first ones, with many more following this year.

Coolness factor 5/5!


Nokia buys Trolltech, gets on the mobile Linux bandwagon! January 28, 2008

Filed under: embedded,Linux,mobile,technology — perak @ 8:39 pm

I just came across this linuxdevice article, according to which Nokia will buy Trolltech! Interesting news! It seems Nokia is willing to adopt Linux in mobiles, in addition to the already Linux based web-pads (N800, N810) which use the Maemo environment (based on Gtk+/gnome). Expect a Gtk+/Qt war in the mobile platform arena too!

Nokia had already made a move towards Linux by embracing the “Open C” libraries last spring in order to help accelerate application development and porting to the Symbian OS.

After the recent Linux push by Google Android, it seems everybody is rushing to get on the mobile Linux bandwagon! Until now, only Motorola tried to embrance Linux, with limited success in far east Asia (China mainly).  The Nokia move will hopefully have a great effect on Linux penetration. With this move Nokia will finally lead two different mobile OSes (Symbian and Linux) which is a very cool move against the rest players (see Microsoft!)